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    Wyświetlanie 1-9 z 9
    Tytuł:
    Structure and magnetic properties of amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ and crystalline Fe₈₂Zr₆Y₁Nb₂Cu₁B₈ alloys
    Autorzy:
    Gondro, J.
    Błoch, K.
    Nabiałek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1153084.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Np
    75.50.Bb
    75.50.Kj
    75.90.+w
    Opis:
    In order to obtain an alloy with a specific set of magnetic properties, the dominant influences of chemical component and thermal treatment selection need to be satisfied. In this paper, the results of investigations into the microstructure and magnetic properties of the following alloys are presented: amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ and crystalline Fe₈₂Zr₆Y₁Nb₂Cu₁B₈. The structure and microstructure were examined using the Mössbauer spectroscopy and X-ray diffractometry. The Fe₈₂Zr₇Nb₂Cu₁B₈alloy was found to be fully amorphous in the as-quenched state and the transmission Mössbauer spectrum for this alloy is typical of that for weak ferromagnets, with an average hyperfine field of 9.86(2) T. The shape of this spectrum was found to have changed noticeably in the case of the Fe₈₂Zr₆Y₁Nb₂Cu₁B₈ alloy. This change was attributed to the presence of the crystalline phase bcc-Fe.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 909-912
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetocaloric effect in amorphous and partially crystallized Fe₈₀Zr₇Cr₆Nb₂Cu₁B₄ alloy
    Autorzy:
    Łukiewska, A.
    Olszewski, J.
    Hasiak, M.
    Gębara, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1047599.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.60.+a
    75.50.Kj
    75.50.Bb
    75.30.Sg
    Opis:
    In the present work the microstructure and thermomagnetic properties of Fe₈₀Zr₇Cr₆Nb₂Cu₁B₄ ribbon in the as-quenched state and after the accumulative annealing in the temperature range 600-800 K for 10 min were studied using Mössbauer spectroscopy and vibrating sample magnetometry. The second order phase transition from ferro- to paramagnetic state is observed. The Curie temperature T_{C} defined as inflection point on the magnetization versus temperature curve recorded on zero-field cooled mode equals 262.5 K for the as-quenched material. With increasing the annealing temperature increase of T_{C} is observed. The maximum value of the magnetic entropy change (-ΔS) observed in the vicinity of the Curie point is equal to 0.85 J/(kg K) for the alloy in the as-quenched state. Moreover, for the samples annealed up to 750 K for 10 min the low intensity maximum at about 190 K related to the supplementary magnetic phase is observed. The presence of this phase was confirmed as additional component visible on hyperfine field distributions of Mössbauer spectra.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 676-679
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CEMS and RF-Mössbauer Study of Nanocrystalline Fe$\text{}_{81}$Zr$\text{}_{7}$B$\text{}_{12}$ Alloy
    Autorzy:
    Kopcewicz, M.
    Grabias, A.
    Nowicki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953186.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    81.40.-z
    75.50.Bb
    75.50.Kj
    Opis:
    The combined conversion electron (CEMS) and γ-transmission Mossbauer spectroscopy is used to investigate the differences in the bulk and surface crystallization of the amorphous Fe$\text{}_{81}$Zr$\text{}_{7}$B$\text{}_{12}$ alloy. The radio-frequency induced effects (rf collapse and side bands) are used to study the microstructure and magnetic behaviour of the alloy in the amorphous and nanocrystalline states. Rf-Mossbauer experiment permits us to distinguish soft magnetic nanocrystalline bcc-Fe phase from microcrystalline α-Fe.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 225-228
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Iron-Based Amorphous and Nanocrystalline Fe-Zr-X-B (X: Cu, Al) Alloy Films
    Autorzy:
    Gościańska, I.
    Toliński, T.
    Ratajczak, H.
    Sovák, P.
    Dlugoš, R.
    Konč, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013068.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Tm
    75.50.Bb
    Opis:
    Thermal stability and magnetic properties of thin films, of a few Fe-based amorphous and nanocrystalline alloys, have been studied. The alloys belong to the class Fe-M-B, whose representatives are: Fe$\text{}_{87}$Zr$\text{}_{4}$Cu$\text{}_{1}$B$\text{}_{8}$, Fe$\text{}_{87}$Zr$\text{}_{7}$B$\text{}_{6}$, and Fe$\text{}_{87}$Zr$\text{}_{7}$Al$\text{}_{1}$B$\text{}_{5}$ and are of particular interest because of their wide variety of magnetic properties. The films were prepared by flash evaporation onto liquid nitrogen cooled substrates. Measurements of the Kerr effect, the Hall effect, and ferromagnetic resonance in the films were carried out as functions of the annealing temperature. It was found that the changes in the coercive field H$\text{}_{c}$, resonance linewidth ΔH$\text{}_{pp}$, effective magnetization M$\text{}_{eff}$, Hall parameters, and resistance were correlated with the structural changes in the studied films.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 463-466
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetocaloric Effect in Amorphous and Partially Crystallized Fe-Zr-Nb-Cu-B Alloy
    Autorzy:
    Gondro, J.
    Błoch, K.
    Nabiałek, M.
    Wallters, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387568.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.47.Np
    75.50.Bb
    75.50.Kj
    75.90.+w
    87.64.Pj
    Opis:
    This paper presents the results of an investigation into the: microstructure, magnetic properties and influence of annealing temperature on the magnetocaloric effect of Fe₈₂Zr₇Nb₂Cu₁B₈ alloy in the as-quenched and partially crystalline state. The microstructure was investigated using Mössbauer spectroscopy. The magnetocaloric effect was observed as a change in the magnetic entropy, which was calculated from isothermal magnetization curves. Fully-amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ alloys, in the as-quenched state, exhibit a Curie temperature equal to (340±5) K. The transmission Mössbauer spectrum for the as-quenched Fe₈₂Zr₇Nb₂Cu₁B₈ alloy is typical for weak ferromagnets with the average hyperfine field of 9.86(2) T. For this alloy in the as-quenched state, the changes in maximum magnetic entropy occur near the Curie points and are equal to 0.95 J/(kg K). Also, the maximum magnetic entropy changes decrease after partial crystallization.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 606-607
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanocrystallization of the Amorphous Fe$\text{}_{14}$Ni$\text{}_{40}$Zr$\text{}_{7}$B$\text{}_{12}$ Alloys Studied by the Mössbauer Spectroscopy
    Autorzy:
    Kopcewicz, M.
    Idzikowski, B.
    Kalinowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035517.pdf
    Data publikacji:
    2002-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.50.Kj
    75.50.Bb
    81.40.-z
    Opis:
    Formation of the soft magnetic nanostructure in amorphous Fe$\text{}_{41}$Ni$\text{}_{40}$Zr$\text{}_{7}$B$\text{}_{12}$ alloy due to heat treatment is studied by the Mössbauer, differential scanning calorimetry, and X-ray diffraction techniques. Annealing at temperatures 520-580ºC leads to the formation of extremely soft nanocrystalline alloy as revealed by the rf-Mössbauer measurements. The superparamagnetic behaviour was observed for the alloy annealed at 620-640ºC. At higher annealing temperatures good soft magnetic properties deteriorate.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 2; 301-307
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Thermomagnetic Properties of $Fe_{86-x}Zr₇M_xNb_2Cu_1B_4$ (M = Co, Ni, (CoCr); x=0 or 6) Amorphous Alloys
    Autorzy:
    Łukiewska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398268.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.60.+a
    75.50.Kj
    75.50.Bb
    75.30.Sg
    Opis:
    The effect of the substitution of Co, Ni or (CoCr) for the part of Fe atoms on the thermal stability and some magnetic properties, i.e. magnetization and magnetocaloric effect of $Fe_{86-x}Zr₇M_xNb_2Cu_1B_4$ (M = Co, Ni, (CoCr); x=0 or 6) alloys was investigated. From X-ray studies it was stated that the investigated alloys in the as-quenched state and after the accumulative annealing for 10 min at 600 K and then 700 K were fully amorphous. The amorphous as-quenched $Fe_{80}Zr_7Ni_6Nb_2Cu_1B_4$ alloy shows the lowest thermal stability and the onset of its crystallization temperature is equal to 775 K. The Arrott plots are almost linear and show positive slope near the Curie temperature. The maximum magnetic entropy change is very sensitive to the chemical composition and annealing conditions of the alloys.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 738-740
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanocrystallisation of Soft Magnetic Fe-Co-Zr-Cu-B Alloys
    Autorzy:
    Wlazłowska, A.
    Ferenc, J.
    Latuch, J.
    Kulik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035520.pdf
    Data publikacji:
    2002-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    75.50.Bb
    75.50.Kj
    75.60.Ej
    81.05.Kf
    81.10.Jt
    81.70.Ex
    81.70.Pg
    Opis:
    In the present study, Fe$\text{}_{41}$Co$\text{}_{41}$B$\text{}_{10}$Zr$\text{}_{7}$Cu$\text{}_{1}$ alloy has been investigated in order to evaluate its thermal stability and structure after heat treatment, as well as the impact of heat treatment on magnetic properties. X-ray diffractometry, differential scanning calorimetry, chemical composition microanalysis, transmission electron microscopy, and magnetic hysteresis loop measurement techniques were employed. The crystallisation temperature of the as-quenched alloy is 490ºC (continuous heating at 5ºC/min). The melt-spun ribbon having 27μm in thickness was annealed for 1 hour at temperatures from 400 to 700ºC. The alloy after treatment at about 550ºC underwent primary crystallisation, with the average size of crystals under 20 nm. This specimen shows the coercive field of 38 A/m, as compared to about 160 A/m reported for a similar alloy (Fe$\text{}_{44}$Co$\text{}_{44}$B$\text{}_{4}$Zr$\text{}_{7}$Cu$\text{}_{1}$) with a similar structure, annealed at 600ºC.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 2; 323-328
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approach to Ferromagnetic Saturation for the Bulk Amorphous Alloy: $(Fe_{0.61}Co_{0.10}Zr_{0.025}Hf_{0.025}Ti_{0.02}W_{0.02}B_{0.20})_{97}Y_{3}$
    Autorzy:
    Błoch, K.
    Nabiałek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386293.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.50.Kj
    75.30.Ds
    75.20.En
    75.47.Np
    75.50.Bb
    75.60.Ej
    Opis:
    The aim of this paper was to conduct studies concerning the magnetization of bulk amorphous $(Fe_{0.61}Co_{0.10}Zr_{0.025}Hf_{0.025}Ti_{0.02}W_{0.02}B_{0.20})_{97}Y_{3}$ alloy when subjected to strong magnetic fields: the specific focus of the paper is the area known as the approach to ferromagnetic saturation. The investigated alloy samples were produced using the suction-casting method, resulting in plates of dimensions 10 mm × 5 mm × 0.5 mm and rods of length 20 mm and diameter 1 mm. The structure was studied using X-ray diffractometry. It was found that investigated samples were amorphous in the as-cast state. The magnetization was measured in a strong magnetic field using a vibrating sample magnetometer. On the basis of the obtained results, the type of structural defects having influence on magnetization in high magnetic fields were determined for the bulk metallic glasses manufactured with different cooling rates.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 413-414
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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